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DK 8 Digestion Unit

Kjeldahl Digestion Units with 8-position aluminum heating block that offers an excellent thermal homogeneity. 
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DK 8F30100420
DK 8 Digester SystemS30100420
DK 8F30110420
DK 8 Digester SystemS30110420
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Thermal homogeneity and precision

Thermal homogeneity and precision
The DK 8 Series digestion unit with aluminum heating block ensures high thermal homogeneity heating up to 450 °C. The temperature of the block is constantly controlled by a microprocessor and is extremely stable, homogeneous and precise: ±0.5°C at all selectable temperatures.

The DK 8 Series guarantees accuracy and repeatability. The DK 8 performs batch digestion of up to 8 samples with 250 ml test tubes - Ø 42 m, reducing the energy consumption (-13% compared to the previous series). Low energy consumption provides lower costs of analysis and limits CO2 release.

Space saving design

Space saving design
The design of the DK series has been carefully engineered to allow laboratories to save valuable space under the hood.

DK Digesters have very compact dimensions: the new aluminum heating block has been lowered and the vertical proportions allow to free precious space in the laboratory.

The structure is made of stainless steel that has been specifically designed and tested to ensure strong resistance to chemicals and mechanical stress.

The aluminum block protection grid provides enhanced heating performance and protects the heating block from splashes and chemicals.

Easy-to-use with the intuitive digital interface

Easy-to-use with the intuitive digital interface
The bright digital display provides maximum visibility and easy-to-read information.

The instrument is operated with 4 keys to navigate the menu options and program the digestions in a simple and fast way. 

Through the intuitive graphic display it is possible to set up to 20 methods with 4 temperature ramps. 

Acoustic signals inform the operator of the completion of the analysis facilitating the daily use of the digester.

The inclination of the front panel protects it from chemical spillage at high temperatures. 

Fume Neutralization System

Fume Neutralization System
For applications where the digestion process produces fumes, acid gases or corrosive substances, the below specific accessory is strongly recommended:
  • KS 1000 Scrubber neutralizes all the fumes

TEMS™ Technology

TEMS™ Technology
DK Series Kjeldahl digestion units work with the innovative TEMS™ benefits, for huge savings.

Time Saving: rapid heating reduces wasted time
Energy Saving: limited energy consumption thus cutting CO2 emissions
Money Saving: cost reduction for each analysis
Space Saving: the narrow footprint saves valuable laboratory bench space

Models

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Genuine consumables for your digestions

Genuine consumables for your digestions

Choosing the right consumables allow the optimization of analytical operations to achieve the highest possible performance of your Digestion Unit. We strongly recommend the use of VELP original consumables in order to be sure to obtain the best performance form your VELP instrument. 

The addition of a suitable catalyst, along with high temperature, have influence on the speed and the efficiency of the mineralization in Kjeldahl analysis. Achieving the highest level of performance in a wide range of Kjeldahl applications is now possible with VELP genuine KjTabs™ catalyst and antifoaming tablets.

VELP Nitrogen Free Weighing Boats are the perfect solution to all the difficult transfer operations of powders or syrupy samples into mineralization test tubes.
Velp.com
Adapter for probe Ø3mm for DK/DKL/ECO
cod. A00000362
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Glass cap
cod. A00000243
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IQ/OQ DK Manual
cod. A00000407
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KjTabs VCM - 1000 pcs/box
cod. A00000274
Velp.com
KjTabs VCT - 1000 pcs/box
cod. A00000276
Velp.com
KjTabs VKPC - 1000 pcs/box
cod. A00000275
Velp.com
KjTabs VS Antifoam - 1000 pcs/box
cod. A00000283
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KjTabs VST - 1000 pcs/box
cod. A00000277
Velp.com
KjTabs VTCT - 1000 pcs/box
cod. A00000281
Velp.com
KjTabs VW - 1000 pcs/box
cod. A00000282
Velp.com
Mineralization Rod, pack. 10 pcs
cod. A00000431
Velp.com
Sample rack DK8-DKL8 test tubes 400ml
cod. A00000403
Velp.com
Sample rack for DK-DKL8
cod. A00000173
Velp.com
Stand for DK-DKL8-DK18/26
cod. A00000184
Velp.com
Suction cap and drip tray for DK-DKL8
cod. A00000175
Velp.com
Support for DK6-DK8-DK18/26-DK6/48
cod. A00000191
Velp.com
Test tube Ø50x300 mm, 400 ml
cod. A00000185
Velp.com
Test tubes Ø42x300 mm, 250 ml 3pcs/box
cod. A00000144
Velp.com
Weighing boats 58x10x10 mm, 100 pcs/box
cod. CM0486000
Velp.com
Weighing boats 70x23x15 mm, 100 pcs/box
cod. CM0486001

TECHNICAL DATA

Construction material: Epoxy painted with chemical resistant coating
Temperature range: Ambient to 450 °C / 842 °F
Stability of the heating block temperature: ± 0,5 °C
Precision of the heating block temperature: ± 0,5 °C
Set temperature: Digital readout in °C or °F
Temperature Calibration: Automatic
Selectable ramps: up to 4 per program
Digestion time range: 1 to 999 minutes
Time selection: 1 minute steps
Countdown: Digital readout
Selectable language: EN, IT
Heating Places 8-position
Size of tubes 250 ml test tubes (Ø 42 mm)
Power: 1150 W
Dimensions (WxHxD):
(aluminum block only)		 230x140x420 mm
9.1x5.5x16.5 in
Dimensions (WxHxD): 230x690x420 mm
9.1x17.2x16.5 in
Weight: 11 kg (24.2 lb)

Brochures & Leaflets

VELP Scientifica invites you to download brochures and leaflets in order to explore our premium quality solutions and to have all the major key arguments, features and specifications of a product in your hands, in any place, and at any time.
DK Series Kjeldahl Digestion Units - Brochure
Learn more about our efficient and reliable Kjeldahl Digesters, with aluminum heating block offering excellent thermal homogeneity.
 
Analytical Instruments - Line Brochure [EN]
VELP Scientifica invites you to download line brochure to explore our premium quality solutions.
Product Portfolio - Brochure [EN]
VELP Scientifica invites you to download product portfolio brochure to explore our premium quality solutions.
Valuable Information On Kjeldahl Method
Learn more about the Kjeldahl principle, first described by Johan Kjeldahl over a century ago (1883).

Comparison tables

Select the category of products you are interested in and this tool will give you an easy overview of what is available at VELP in order to find the product that is perfect for you. These comparison tables provide a brief description with side by side features from basic equipment to the most advanced analytical solutions.
VELP Test Tubes Comparison Table
An overview of test tubes available at VELP to find the perfect product for your applications.

 

Application notes

Choose among a comprehensive library of Application Notes / White Papers and learn more on how to optimize the performance of your VELP instruments. These documents offer typical analyses of well-known samples, together with official references and suggestions, to make you an expert!
E-book - Barley and Feed: N/Protein Determination and Fiber Determination
Discover more about the nutritional properties of barley and how to determine n/protein and fiber to optimize livestock operations. Download the e-book with results on BIPEA proficiency testing sample.
E-book - Kjeldahl and Dumas Method Comparison: N/Protein Determination in Feed
Discover more about the Kjeldahl and Dumas methods for the determination of n/protein in various feed samples, a key parameter concerning quality control and protein declaration. Download the e-book with results on BIPEA proficiency testing samples and a comprehensive comparison of the two techniques.
Casein Determination in Milk - Kjeldahl method
Casein proteins are a family of proteins involved in the production of cheese and fermented milk. They are also extremely important nitrogen compounds in the dairy products production, additives in medicine, and have a technical use in cosmetics, paints and adhesives.
Learn how to obtain excellent performance with DK / DKL and UDK Series and how to work in accordance with AOAC and ISO.
Guidelines for choosing the correct Velp Kjtabs in Kjeldahl Analysis
The digestion phase is the most time-consuming step of the Kjeldahl analysis. Speeding up the process and ensuring a proper outcome is of fundamental importance when it comes to efficiency in the laboratory.
VELP designed seven different types of accurately pre-dosed KjTabs™ tablets to speed up the mineralization process. Along with catalysts, VELP produces antifoaming KjTabs™ to reduce foam formation during the initial phase of the mineralization process.
N/Protein Determination in Cereals - Kjeldahl method
Cereals contain between 8-15% of different kinds of proteins such as albumins, globulins, prolamines, gliadins, glutelins and glutenins. Their chemical composition is important not only for nutritional purposes, but also for the bread dough and its process of baking and for economical reason. Learn how to obtain excellent performance with DK / DKL and UDK Series and how to work in accordance with AOAC and AACC.
N/Protein Determination in Cheese - Kjeldahl method
Due to the greater demand and consumption of dairy products, protein analysis has become more and more important to ensure food safety, food quality and fairness in international trade. Learn how to obtain excellent performance with DK / DKL and UDK Series, and how to work in accordance with ISO and AOAC.
N/Protein Determination in Feed - Kjeldahl method
Protein is a critical nutrient in cattle, pigs, poultry, sheep, horses and pet food diets. It is required for milk production and reproductive tract reconditioning after calving.
Learn how to obtain excellent performance with DK / DKL and UDK Series and how to work in accordance with AOAC.
N/Protein Determination in Fishmeal - Dumas and Kjeldahl method comparison
Fishmeal is an important food used in animal husbandry and in aquaculture. It is also the main ingredient of the commonly marketed feed for aquarium fish. Discover more on the results obtained with the Kjeldahl and the Dumas Method for the determination of protein content in fishmeal.
N/Protein Determination in Milk - Kjeldahl method
The protein fraction includes caseins (80%) and whey proteins (20%) and it is of interest, not only from the nutritional point of view, but also from a technological one. Milk proteins have particular chemical properties which contribute to create typical sensory features, influencing the whole food processing. Learn how to obtain excellent performance with DK / DKL and UDK Series and how to work in accordance with AOAC and ISO.
N/Protein Determination in Milk Powder - Kjeldahl method
Milk powders contain all twenty-one standard amino acids, the building blocks of proteins, and are high in soluble vitamins and minerals. Compared to liquid milk, this product has a far longer shelf life and does not need to be refrigerated, due to its low moisture content.
Learn how to obtain excellent performance with DK / DKL and UDK Series and how to work in accordance with AOAC and ISO.
N/Protein Determination in Nuts - Kjeldahl method
Nuts are an excellent source of protein and healthy fats; their amounts vary depending on the type of nut.
Peanuts, for example, provide a good source of B vitamins essential for energy, protein metabolism, and the synthesis of red blood cells and their protein content is about 29%.
Learn how to obtain excellent performance with DK / DKL and UDK Series and how to work in accordance with AOAC.
N/Protein Determination in Probiotic Drinks - Kjeldahl method
A probiotic is a live microbial food ingredient that beneficially affects the host through its effects in the intestinal tract. They are widely used to prepare fermented dairy products.
Learn how to obtain excellent performance with DK / DKL and UDK Series and how to work in accordance with AOAC and ISO.
Nitrogen and Protein Determination in Commercial Whole Liquid Milk - Dumas vs Kjeldahl Method
Nitrogen and Protein Determination in Insect Flour: Kjeldahl and Dumas comparison
The trend of using edible insects to produce food is growing. Thus, the food industry needs to find analytical methods and instruments to assess their potential. Discover how to determine N/Protein content according to the Kjeldahl and Dumas methods.
TKN Determination in Water and Wastewater
Nitrogen-containing compounds act as nutrients in streams, rivers, and reservoirs. The major routes of entry of nitrogen into bodies of water are municipal and industrial wastewater, septic tanks, feedlot discharges, animal waste runoff from fertilized agricultural fields and lawns and discharges from car exhausts. Bacteria in water quickly convert nitrites to nitrates and this process uses up oxygen. High nitrates in drinking water can cause digestive disturbances in people.
Total Nitrogen determination in Urea – Dumas vs Kjeldahl Method
Urea is a crystalline substance widely used as a fertilizer, feed supplement, and starting material for plastics and drugs. It has a very high nitrogen content; it is readily converted to nitrate in the soil and is therefore considered one of the most concentrated nitrogenous fertilizers. The importance of having a controlled Nitrogen content in this product is crucial to always keep the same production standards.
Whey Protein Determination in Milk
In order to determine soluble whey proteins (WP), it is necessary to know the amount of milk total nitrogen (Ntot), non-casein nitrogen (NCN) and non-proteins nitrogen substances (NPN).
Learn how to obtain excellent performance with DK / DKL and UDK Series and how to work in accordance with AOAC and ISO.

Certifications

Our compliance to statutory rules and regulations worldwide.
With the CE mark, VELP Scientifica declares that the products are designed and manufactured in compliance with the essential safety requirements of the European Directive on Safety.
The Certification Body (CB) Certificate is an international program created by the IECEE for the acceptance of product safety test results among participating laboratories and certification organizations around the world.
The cNEMKOus mark ensures this product is designed and manufactured in compliance with the International Directive on Safety IEC/EN 61010-1. The cNEMKOus mark has the same legal status as any other NRTL/SCC accredited marks, for U.S. and Canada.
CE Declaration of Conformity VELP Scientifica Digestion System and Hydrolysis
With the CE mark, VELP Scientifica declares that the products are designed and manufactured in compliance with the essential safety requirements of the European Directive on Safety, matching EU consumer safety, health or environmental requirements.
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FAQ
Check technical sheets with answers to most frequently asked questions
What do we have to add to the test tube to perform the digestion step?
To properly perform the digestion step, it is necessary to prepare the glass test tube with the sample and:

1. KjTabs™ catalyst tablets to accelerate the digestion
2. Antifoam tables (especially recommended in the case of samples with a high-fat content)
3. 12 - 15 ml of concentrated sulfuric acid (98%)
How to insert the sample into the test tube?
The sample must be weighed within Nitrogen free weighing boats (CM0486000) and then placed inside the test tubes. In so doing there is no risk of part of the sample sticking to the test tube parts and the digestion therefore not being performed correctly.
Which kind of test tubes does VELP supply?
VELP provides a full set of test tubes. Download here the comparison table!